podman healthcheck run (phase 1)

Add the ability to manually run a container's healthcheck command.
This is only the first phase of implementing the healthcheck.
Subsequent pull requests will deal with the exposing the results and
history of healthchecks as well as the scheduling.

Signed-off-by: baude <bbaude@redhat.com>

1 files changed, 29 insertions, 0 deletions

diff --git a/libpod/image/image.go b/libpod/image/image.go
index b20419d7b..8c98de3d3 100644
--- a/libpod/image/image.go
+++ b/libpod/image/image.go
@@ -1151,3 +1151,32 @@ func (i *Image) Save(ctx context.Context, source, format, output string, moreTag
 
 	return nil
 }
+
+// GetConfigBlob returns a schema2image.  If the image is not a schema2, then
+// it will return an error
+func (i *Image) GetConfigBlob(ctx context.Context) (*manifest.Schema2Image, error) {
+	imageRef, err := i.toImageRef(ctx)
+	if err != nil {
+		return nil, err
+	}
+	b, err := imageRef.ConfigBlob(ctx)
+	if err != nil {
+		return nil, errors.Wrapf(err, "unable to get config blob for %s", i.ID())
+	}
+	blob := manifest.Schema2Image{}
+	if err := json.Unmarshal(b, &blob); err != nil {
+		return nil, errors.Wrapf(err, "unable to parse image blob for %s", i.ID())
+	}
+	return &blob, nil
+
+}
+
+// GetHealthCheck returns a HealthConfig for an image.  This function only works with
+// schema2 images.
+func (i *Image) GetHealthCheck(ctx context.Context) (*manifest.Schema2HealthConfig, error) {
+	configBlob, err := i.GetConfigBlob(ctx)
+	if err != nil {
+		return nil, err
+	}
+	return configBlob.ContainerConfig.Healthcheck, nil
+}